How the Heart Works

Topic Contents

Topic Contents

How the Heart Works

Topic Overview

The heart is at the center of your circulatory system, which is a network of blood
vessels that delivers blood to every part of your body. Blood carries oxygen and other
important nutrients that all body organs need to stay healthy and to work properly.

Your heart is a muscle, and its job is to pump blood throughout your circulatory system.

How does my heart pump blood?

Your heart is divided into two separate pumping systems, the right side and the left
side.

The right side of your heart receives oxygen-poor blood from your veins and pumps
it to your lungs, where it picks up oxygen and gets rid of carbon dioxide.

The left side of your heart receives oxygen-rich blood from your lungs and pumps it
through your arteries to the rest of your body.

How does blood flow through the heart?

The right atrium receives oxygen-poor blood from the body and pumps it to the right
ventricle through the tricuspid valve.

The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary
valve.

The left atrium receives oxygen-rich blood from the lungs and pumps it to the left
ventricle through the mitral valve.

The left ventricle pumps the oxygen-rich blood through the aortic valve out to the
rest of the body.

The left and right atria are smaller chambers that pump blood into the ventricles.
The left and right ventricles are stronger pumps. The left ventricle is the strongest
because it has to pump blood out to the entire body. When your heart functions normally,
all four chambers work together in a continuous and coordinated effort to keep oxygen-rich
blood circulating throughout your body. Your heart has its own electrical system that
coordinates the work of the heart chambers (heart rhythm) and also controls the frequency
of beats (heart rate).

How does my heart maintain its normal function?

The task of your heart is to pump enough blood to deliver a continuous supply of oxygen
and other nutrients to the brain and the other vital organs. To do this, your heart
needs to:

Regulate the timing of your heartbeat. Your heart's electrical system controls the timing of the pump. The electrical system keeps your heart beating in
a regular rhythm and adjusts the rate at which it beats. When the electrical system
is working properly, it maintains a normal heart rate and rhythm. Problems with this
electrical system can cause an arrhythmia, which means that your heart chambers are
beating in an uncoordinated or random way or that your heart is beating too fast (tachycardia)
or too slow (bradycardia).

Keep your heart muscle healthy. The four chambers of your heart are made of a special type of muscle called myocardium.
The myocardium does the main pumping work: It relaxes to fill with blood and then
squeezes (contracts) to pump the blood. "Contractility" describes how well the heart
muscle squeezes. After pumping, your heart relaxes and fills with blood. The muscle
must be able to relax enough so that it can fill with blood properly before it pumps
again. The health of your heart muscle affects both its contractility and its ability
to relax, both of which determine whether your heart is able to pump enough blood
each time it beats. Problems with the contractility of your heart can be caused by
problems with the muscle itself (such as a viral infection of the heart muscle or
an inherited heart muscle disorder) or by problems with the blood supply to the heart
muscle (such as reduced blood flow to the heart muscle, called ischemia). Your heart
muscle needs its own supply of blood because, like the rest of your body, it needs
oxygen and other nutrients to stay healthy. For this reason, your heart pumps oxygen-rich
blood to its own muscle through your coronary arteries.

Keep blood flowing efficiently. Your heart has four valves that control the flow of blood in and out of the chambers.
There are valves between the atrium and the ventricle on each side of your heart.
There is also a valve controlling the flow of blood out of each of your ventricles.
The valves are designed to keep blood flowing forward only. When each chamber contracts,
a valve opens to allow blood to flow out. When the chamber relaxes, the valve closes
to prevent blood from leaking back into the chamber and to allow the chamber to fill
with blood again. A problem with your heart valves can disrupt the normal flow of
blood and cause problems for your heart.

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